Tool-holder



(No M0de1. I "zvsneetsLsheet 1.

H. S. JOHNSON.

v TooL HOLDER. No. 604,009. Patented May 10,1898.

(No M0001.) Y 2 ssssssss 110002'.

PLS. JVDHN'SON'.A

TOOL HOLDER. l

100004,0-00 Patented May 10,1008.

llum

imlmjlllll @wbt/neuw v i M, 90m M0 I l W @Hoz-muy?? AHOBART S. JOHNSON, OF MADISONVISCONSIN:

srncrrrcarron formingpart of Le-,eers 'Patent No; eofrooe, dated May io, ieee. Application tiled November 22, 1897. Serial No. 659,4;73.' (No model.)

To all roh/m t may concern:

Be it known that I, HOBART S. JOHNSON, a citizen of the United States, residing at Madison, in the county of Dane and State of Wiscousin, have invented certain new and useful Improvements ,in Tool-Holders, of which the following is a specification.

My present invention pertainstto improvee ments in tool-holders, thezconstruction and advantages of which will be hereinafter set forth, reference being had to the annexed drawings, Wherein- Figure l is a perspective View of the holder, the parts being separated and the central post, rising from the base-plate or cross-slide, being broken away Fig. 2, a top plan view; Fig. 3, a vertical sectional view on the line l l of Fig. 2; Fig. 4l, asimilar View on the line 2 2, and Fig. 5 a detail sectional view of the clamping shell or cone.

The object of my invention is to provide a simple and h ighly-eflicient tool-post of the turret type, onewhich maybe readily manipulated to bring theevariousf tools into operative position with theA work and to hold them steady in such adjusted position without any chattering or vibration of the parts.

Referring to the drawings, A denotes a cross-slide or base, which may be made ot'l any desired form or type, and B a cylindrical post or standard extending upwardly therefrom. The cross-slide is also formed with a studor. block C to one side of the post and at a distance (more or lessltherefrom. u l y,

D indicates the tool-carrier, provided with tool-seats E and suitableclamping-screws F,

as is usual in thisclass of toolholders. Said carrier is formed with a tapering opening, which extends therethrough, the opening being largest at the top of the shell and gradually decreasing in diameter as it nears the bottom.

Around the bottom or base of the carrier there is formed a series of pockets or recesses G, of such dimensions and form as to receive the stud or block O when the tool-carrier is lowered into working position. Immediately end may be protruded into the recess or pocket to any desired degree and will of course determine the elevationof the tool-carrier with reference to the cross-slide or base-plate.

I indicates fthe clamping cone or shell, the interior diameter being such that it tits loosely upon thecentral post B when the parts are not clamped'. `The outer face of the cone or shell gradually ytapers from the top to the bottom, the angle upon which it is formed being the complement of that upon which the inner face of the tool-carrier is made, so that said parts have a direct bearing throughout substantially their entire surface when the parts are in their clamped position, as denoted in Fig. 4. It will be seen upon reference to this figure that the shell or cone is of such length that it does not quite touch the cross-slide A.

As shown in Figs. 1, 3, and 5, theclamping shell or cone I is provided or formed with a series of slots J, extending from the bottom up toward the top, said slots permitting a certain amountlof give or yield to the intermediate sections formed thereby.

A recessor opening K is formed in one side ot' the cone, and a screw L, provided with a reduced end M, is mounted in the tool-carrier D, the reduced end M passing into the opening K, (of larger diameter,) as shown in Fig.

.4. It will thus be seen that said parts are held together, but may have a slight relative movement one to the other. Nindicates the main screw for elevating and lowering the"n tool-carrier and cone and locking said parts together. Said screw works in a nut O, formed in the head of the post B, and is also provided with a collar or flange P, which is seated in a recess formed in the top of the cone, a clamping-ring Q being used to form the upper bearing for said collar.

v'llheoperation of the holder is as follows, assuming, of course, that the necessary tools have been secured within the seats E and that the tool-carrier is in its elevated position: The carrier D is rotated until the desired tool has been brought intoproper relation to the work, at which time one of the recesses or pockets G will be directly over the stud or block O. The operator then turns the main screw N, so that the tool-carrier and the clamp ing cone or shell I are lowered, both parts moving down together, the reduced endM of loo the screw L bearing against the lower end of the opening K.' The screw N is rotated until the lower end of screw H comes into contact with the stud or block C, said screw having been or being adj usted to regulate and secure the proper elevation of the tool. This of course brings the tool-shell D to a stop, and a further rotation of the main screw N will carry or force the split cone or shell I downward, causing it to wedge itself in between the toolcarrier D and the central post or standard B, securely clamping or binding all the parts together and preventing all movement or chattering of the tool. Of necessity the entrance of the stud or block C into the recess or pocket G will prevent any turning of the shell. When it is desired to bring another tool into place, all that is necessary is to elevate screw N, which will first withdraw the cone I, releasing the parts, and then carry said cone and the carrier D up until the stud or block C is clear of the recess or pocket. The tool-carrier may then be turned to the desired position independent of any movement of the screw N.

It is of course manifest that a tool-carrier of a form other than that set forth may be employed so long as the internal bore be such that it will act in conjunction with the cone I.

Having thus described my invention, what I claim isl. In a tool-holder, the combination of a cross-slide or base; a post extending up therefrom; a shell mounted upon said post and provided with an outer tapering face; a tool-carrier provided with an internal tapering bore surrounding said shell; a connection between said shell and tool-carrrier; and a screw for raising and lowering the taper-shell.

2. In a tool-holder, the combination of a cross-slide or base; a post extending up therefrom; a shell mounted upon said post and provided with an outer tapering face; a tool-carrier provided with an internal tapering bore surrounding said shell; a connection between said shell and tool-carrier a screw for raising and lowering the taper-shell; and means for determining the descent of the tool-carrier.

3. In a tool-holder, the combination of a cross-slide or base; a post extending up therefrom; a shell mounted upon said post and provided with an outer tapering face; a tool-carrier provided with an internal tapering bore surrounding said shell; a connection between said shell and tool-carrier; recesses formed in the base of the carrier; a post extending up from the base in line with said recesses; adj listing-screws passing through the tool-carrier into said recesses; and a screw working in the post connected to the shell and designed to elevate and lower the part-s.

et. In a tool-holder, the combination of a cross-slide or base; a post extending up therefrom; a shell mounted upon said post and provided with an outer tapering face and slots J in its side; a tool-carrier provided with an internal tapering bore surrounding said shell and with recesses or pockets G and adjustingscrews II; a connection between said shell and tool-carrier; a block extending up from the base in line with the recesses in the tool-carrier and a screw working'in the upper end of the post and connected to the shell.

5. In a tool-holder, the combination of a cross-slide or base; a post extending up therefrom; a shell mounted upon said post provided with an outer tapering face and slots eI in its side; a tool-carrier provided with an internal tapering bore surrounding said shell,and with recesses or pockets G in its base; adjustingscrews extending through the carrier into said recesses; a block extending up from the base in line with said recesses; a screw L secured in the tool-carrier and extending into an opening K in the shell; and a screw working in a nut carried in the upper end of the post, said screw being connected to the shell, substantially as described.

6. In a tool-holder, the combination of a cross-slide or base; a post extending upwardly therefrom; a tool-carrier; a wedge-shaped shell intermediate said carrier and post;

means for raising and lowering the carrier and 

